R&S®SMCVB-K166
DTMB
User Manual
(;Ý:Y2)
1179104102
Version 04
This document describes the following software options:
●
R&S®SMCVB-K166 DTMB (1434.3931.xx)
This manual describes firmware version FW 5.00.122.xx and later of the R&S®SMCV100B.
© 2022 Rohde & Schwarz GmbH & Co. KG
Muehldorfstr. 15, 81671 Muenchen, Germany
Phone: +49 89 41 29 - 0
Email: info@rohde-schwarz.com
Internet: www.rohde-schwarz.com
Subject to change – data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
1179.1041.02 | Version 04 | R&S®SMCVB-K166
The following abbreviations are used throughout this manual: R&S®SMCV100B is abbreviated as R&S SMCVB, R&S®WinIQSIM2 is
abbreviated as R&S WinIQSIM2
R&S®SMCVB-K166
Contents
1 Welcome to the DTMB option............................................................... 5
1.1 Accessing the DTMB dialog.........................................................................................5
1.2 What's new.....................................................................................................................5
1.3 Documentation overview..............................................................................................5
1.3.1 Getting started manual....................................................................................................6
1.3.2 User manuals and help................................................................................................... 6
1.3.3 Service manual............................................................................................................... 6
1.3.4 Instrument security procedures.......................................................................................6
1.3.5 Printed safety instructions............................................................................................... 6
1.3.6 Data sheets and brochures............................................................................................. 7
1.3.7 Release notes and open source acknowledgment (OSA).............................................. 7
Contents
1.3.8 Application notes, application cards, white papers, etc...................................................7
1.4 Scope............................................................................................................................. 7
1.5 Notes on screenshots...................................................................................................8
2 About the DTMB option......................................................................... 9
2.1 Required options...........................................................................................................9
3 DTMB configuration and settings.......................................................10
3.1 General settings.......................................................................................................... 10
3.2 Input signal settings................................................................................................... 12
3.2.1 General settings............................................................................................................ 12
3.2.2 Info................................................................................................................................ 15
3.2.3 Test signal settings........................................................................................................16
3.2.4 IP channel x settings..................................................................................................... 18
3.3 Coding settings........................................................................................................... 21
3.4 Special settings...........................................................................................................24
3.5 Local IP data network settings.................................................................................. 24
3.6 TS player...................................................................................................................... 27
3.6.1 TS Player settings......................................................................................................... 28
3.6.2 Player output settings....................................................................................................31
3.6.3 Seamless loop settings................................................................................................. 35
3.7 Global connector settings..........................................................................................36
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4 Performing DTMB signal generation tasks........................................37
4.1 Configuring the input signal...................................................................................... 37
4.1.1 How to apply an external IP input signal....................................................................... 37
4.1.2 How to apply an external TS input signal......................................................................40
4.1.3 How to generate an internal TS signal.......................................................................... 41
4.2 Monitoring the input signal........................................................................................ 42
4.2.1 How to monitor external IP input data........................................................................... 42
4.2.2 How to monitor an external TS input signal.................................................................. 43
4.2.3 How to monitor an internal TS player signal................................................................. 43
5 Remote-control commands.................................................................44
5.1 General commands.....................................................................................................45
5.2 Input signal commands.............................................................................................. 47
Contents
5.2.1 General commands.......................................................................................................48
5.2.2 Info commands..............................................................................................................50
5.2.3 Test signal commands...................................................................................................52
5.2.4 IP subsystem.................................................................................................................54
5.3 Coding commands......................................................................................................58
5.4 Special commands......................................................................................................60
5.5 TSGen subsystem.......................................................................................................61
5.6 BCIP subsystem..........................................................................................................69
Glossary: Abbreviations......................................................................72
Glossary: Specifications..................................................................... 74
List of commands................................................................................ 75
Index......................................................................................................77
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1 Welcome to the DTMB option
The R&S SMCVB-K166 is a firmware application that adds functionality to generate
signals in accordance with the DTMB digital standard.
The R&S SMCVB-K166 option features:
●
This user manual contains a description of the functionality that the application provides, including remote control operation.
All functions not discussed in this manual are the same as in the base unit and are
described in the R&S SMCV100B user manual. The latest version is available at:
www.rohde-schwarz.com/manual/SMCV100B
Installation
You can find detailed installation instructions in the delivery of the option or in the
R&S SMCV100B service manual.
Welcome to the DTMB option
Documentation overview
DTMB signal generation
1.1 Accessing the DTMB dialog
To open the dialog with DTMB settings
► In the block diagram of the R&S SMCV100B, select "Baseband > DTMB".
A dialog box opens that displays the provided general settings.
The signal generation is not started immediately. To start signal generation with the
default settings, select "State > On".
1.2 What's new
This manual describes firmware version FW 5.00.122.xx and later of the
R&S®SMCV100B.
Compared to the previous version there are editorial changes only.
1.3 Documentation overview
This section provides an overview of the R&S SMCV100B user documentation. Unless
specified otherwise, you find the documents on the R&S SMCV100B product page at:
www.rohde-schwarz.com/manual/smcv100b
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1.3.1 Getting started manual
Introduces the R&S SMCV100B and describes how to set up and start working with the
product. Includes basic operations, typical measurement examples, and general information, e.g. safety instructions, etc. A printed version is delivered with the instrument.
1.3.2 User manuals and help
Separate manuals for the base unit and the software options are provided for download:
●
●
Welcome to the DTMB option
Documentation overview
Base unit manual
Contains the description of all instrument modes and functions. It also provides an
introduction to remote control, a complete description of the remote control commands with programming examples, and information on maintenance, instrument
interfaces and error messages. Includes the contents of the getting started manual.
Software option manual
Contains the description of the specific functions of an option. Basic information on
operating the R&S SMCV100B is not included.
The contents of the user manuals are available as help in the R&S SMCV100B. The
help offers quick, context-sensitive access to the complete information for the base unit
and the software options.
All user manuals are also available for download or for immediate display on the Internet.
1.3.3 Service manual
Describes the performance test for checking compliance with rated specifications, firmware update, troubleshooting, adjustments, installing options and maintenance.
The service manual is available for registered users on the global Rohde & Schwarz
information system (GLORIS):
https://gloris.rohde-schwarz.com
1.3.4 Instrument security procedures
Deals with security issues when working with the R&S SMCV100B in secure areas. It
is available for download on the Internet.
1.3.5 Printed safety instructions
Provides safety information in many languages. The printed document is delivered with
the product.
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1.3.6 Data sheets and brochures
The data sheet contains the technical specifications of the R&S SMCV100B. It also
lists the options and their order numbers and optional accessories.
The brochure provides an overview of the instrument and deals with the specific characteristics.
See www.rohde-schwarz.com/brochure-datasheet/smcv100b
1.3.7 Release notes and open source acknowledgment (OSA)
The release notes list new features, improvements and known issues of the current
firmware version, and describe the firmware installation.
The open-source acknowledgment document provides verbatim license texts of the
used open source software.
See www.rohde-schwarz.com/firmware/smcv100b
Welcome to the DTMB option
Scope
1.3.8 Application notes, application cards, white papers, etc.
These documents deal with special applications or background information on particular topics.
See www.rohde-schwarz.com/application/smcv100b
1.4 Scope
Tasks (in manual or remote operation) that are also performed in the base unit in the
same way are not described here.
In particular, it includes:
●
Managing settings and data lists, like saving and loading settings, creating and
accessing data lists, or accessing files in a particular directory.
●
Information on regular trigger, marker and clock signals and filter settings, if appropriate.
●
General instrument configuration, such as checking the system configuration, configuring networks and remote operation
●
Using the common status registers
For a description of such tasks, see the R&S SMCV100B user manual.
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1.5 Notes on screenshots
When describing the functions of the product, we use sample screenshots. These
screenshots are meant to illustrate as many as possible of the provided functions and
possible interdependencies between parameters. The shown values may not represent
realistic usage scenarios.
The screenshots usually show a fully equipped product, that is: with all options installed. Thus, some functions shown in the screenshots may not be available in your particular product configuration.
Welcome to the DTMB option
Notes on screenshots
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2 About the DTMB option
DTMB is the name of the released standard for digital terrestrial television and digital
terrestrial handheld service in China. The transmission standard complies with specification Chines National Standard GB 20600-2006.
The transmission standard supports two techniques for modulation. Orthogonal frequency division multiplex (OFDM) and a single carrier technique.
The forward error correction (FEC) is based on a randomizer, BCH encoder and LDPC
encoder. Time interleaving is performed afterwards.
2.1 Required options
The equipment layout for generating DTMB signals includes:
●
●
●
About the DTMB option
Required options
Base unit
Option Enable Broadcast Standard (R&S SMCVB-K519)
Option DTMB (R&S SMCVB-K166)
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3 DTMB configuration and settings
Access:
► Select "Baseband > DTMB".
The remote commands required to define these settings are described in Chapter 5,
"Remote-control commands", on page 44.
Settings:
● General settings......................................................................................................10
● Input signal settings................................................................................................ 12
● Coding settings....................................................................................................... 21
● Special settings.......................................................................................................24
● Local IP data network settings................................................................................ 24
● TS player.................................................................................................................27
● Global connector settings........................................................................................36
DTMB configuration and settings
General settings
3.1 General settings
Access:
► Select "Baseband > DTMB".
The tab provides functionality for calling default settings, "Save/Recall" settings and
carrier mode settings.
Settings:
State.............................................................................................................................. 11
Set To Default................................................................................................................11
Save/Recall................................................................................................................... 11
Single Carrier Mode.......................................................................................................11
Dual Pilot Tone.............................................................................................................. 11
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State
Activates the standard and deactivates all the other digital standards and digital modulation modes in the same path.
Remote command:
[:SOURce<hw>]:BB:DTMB:STATe on page 46
Set To Default
Calls the default settings. The values of the main parameters are listed in the following
table.
Remote command:
[:SOURce<hw>]:BB:DTMB:PRESet on page 45
Save/Recall
Accesses the "Save/Recall" dialog, that is the standard instrument function for saving
and recalling the complete dialog-related settings in a file. The provided navigation
possibilities in the dialog are self-explanatory.
The settings are saved in a file with predefined extension. You can define the filename
and the directory, in that you want to save the file.
See also, chapter "File and Data Management" in the R&S SMCV100B user manual.
DTMB configuration and settings
General settings
Parameter Value
State Not affected by the "Set to Default"
Remote command:
[:SOURce<hw>]:BB:DTMB:SETTing:CATalog? on page 46
[:SOURce<hw>]:BB:DTMB:SETTing:DELete on page 46
[:SOURce<hw>]:BB:DTMB:SETTing:LOAD on page 46
[:SOURce<hw>]:BB:DTMB:SETTing:STORe on page 47
Single Carrier Mode
Enables/disables single carrier mode.
"On"
"Off"
Uses single carrier mode.
Uses COFDM as modulation scheme for multi-carrier mode.
Remote command:
[:SOURce<hw>]:BB:DTMB:SINGle on page 47
Dual Pilot Tone
Requires "Single Carrier Mode > On".
Enables/disables insertion of the dual pilot tone.
"On"
"Off"
Inserts 2 pilots at ±0.5 symbol rate.
No pilot insertion.
Remote command:
[:SOURce<hw>]:BB:DTMB:DUAL:PILot on page 47
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3.2 Input signal settings
Access:
► Select "Baseband > DTMB > Input Signal".
Input signal tasks
The settings allow you to perform the following tasks:
●
●
●
How to: Chapter 4.1, "Configuring the input signal", on page 37.
DTMB configuration and settings
Input signal settings
The dialog provides access to settings to configure the input signal. Also, it provides physical layer information for external signals and transport stream signals.
For internal test signals, you can configure payload and structure of test packets.
Selecting an MPEG TS source
Displaying information about the selected MPEG TS (e.g. data rate)
Configuring the internal MPEG TS test packets or internal IP test packets
Settings:
● General settings......................................................................................................12
● Info.......................................................................................................................... 15
● Test signal settings..................................................................................................16
● IP channel x settings...............................................................................................18
3.2.1 General settings
Access:
► Select "Input Signal > General".
The tab provides general settings to configure the input signal.
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Settings:
Source...........................................................................................................................13
Input.............................................................................................................................. 13
Input Format..................................................................................................................13
IP TS Channel...............................................................................................................14
Stuffing.......................................................................................................................... 14
Test Signal.....................................................................................................................14
Source
Sets the modulation source for the input signal.
"External"
"TS Player"
DTMB configuration and settings
Input signal settings
Uses a transport stream, that is input at the "TS IN"/"IP Data" interface.
For more information about connecting to the interfaces, see also:
●
"TS IN" interface: Section "Configuring the Global Connectors" in
the R&S SMCV100B user manual.
●
"IP Data" interface: Chapter 3.5, "Local IP data network settings",
on page 24.
Uses an internal transport stream with TS packet data played from a
file. The player requires no option.
Playing encrypted files with extension _c requires a stream library
option R&S SMCVB-KSx.
See also:
●
Chapter 3.6, "TS player", on page 27
●
Supported TS player file types
"Test Signal"
Remote command:
[:SOURce<hw>]:BB:DTMB:SOURce on page 48
Input
Requires "Source > External".
Sets the external input interface.
"TS IN"
"IP"
Remote command:
[:SOURce<hw>]:BB:DTMB:INPut on page 48
Input Format
Requires "Input > TS IN".
Sets the format of the input signal.
"ASI"
"SMPTE 310"
Uses an internal test signal as specified in Chapter 3.2.3, "Test signal
settings", on page 16.
Input for serial transport stream data. The signal is input at the "User
1" connector.
Input for IP-based transport stream data (TSoverIP). The signal is
input at the "IP Data" connector.
ASI format
SMPTE 310 format
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Remote command:
[:SOURce<hw>]:BB:DTMB:INPut:FORMat on page 49
IP TS Channel
Requires "Input > IP".
Selects the IP-based transport stream (TS) channel. You can select 1 out of 4 IP TS
channels as input at the "IP Data" interface.
To configure a particular channel, see Chapter 3.2.4, "IP channel x settings",
on page 18.
Remote command:
[:SOURce<hw>]:BB:DTMB:INPut:TSCHannel on page 49
Stuffing
Requires "Source > External/TS Player".
Activates stuffing.
"On"
"Off"
Remote command:
[:SOURce<hw>]:BB:DTMB:STUFfing on page 49
DTMB configuration and settings
Input signal settings
The installed input interface provides the transport stream data rate
required for the current modulation parameters (regardless of the
input data rate of the external transport stream).
The data rate of the transport stream source must match the data
rate required for the current modulation parameters.
The value equals the "Max. Useful Data Rate" on page 15.
Test Signal
Requires "Source > Test Signal".
Defines the test signal data.
The data consists of test TS packets.
"Test TS Packet"
Standardized packet data used as modulation data in the transport
stream. To configure the packet structure, select the side tab "Test
Signal > Test TS Packet".
See also Chapter 3.2.3, "Test signal settings", on page 16.
Remote command:
[:SOURce<hw>]:BB:DTMB:TESTsignal on page 53
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3.2.2 Info
Access:
► Select "Input Signal > Info".
DTMB configuration and settings
Input signal settings
The tab displays information on the input signal.
Settings:
Packet Length............................................................................................................... 15
Max. Useful Data Rate.................................................................................................. 15
Measured Data Rate..................................................................................................... 16
Useful Data Rate...........................................................................................................16
Packet Length
Requires "Source > External".
Displays the packet length of the external transport stream in bytes.
If the packet length does not match the specified length, the output signal is erroneous.
"Packet Length > Invalid" is displayed.
"188"
"Invalid"
Remote command:
[:SOURce<hw>]:BB:DTMB:PACKetlength? on page 51
Max. Useful Data Rate
Requires "Source > External/TS Player".
Displays the maximum data rate, that is derived from the current modulation parameter
settings.
The value is the optimal value at the TS input interface, that is necessary for the modulator.
Remote command:
[:SOURce<hw>]:BB:DTMB:USEFul[:RATE]:MAX? on page 51
188 byte packets specified for serial input ("Input > TS IN") and parallel input ("Input > IP").
Packet length does not match the specified length.
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Measured Data Rate
Requires "Source > External".
Displays the measured value of the data rate r
●
●
The value r
r
Remote command:
[:SOURce<hw>]:BB:DTMB[:INPut]:DATarate? on page 52
Useful Data Rate
Requires "Source > External/TS Player".
Displays the data rate of useful data r
rate is measured at the input of the installed input interface.
Remote command:
[:SOURce<hw>]:BB:DTMB:USEFul[:RATE]? on page 51
DTMB configuration and settings
Input signal settings
of one of the following:
meas
External transport stream including null packets input at "User 1" connector
External transport stream including null packets input at "IP Data/LAN" connector
(TSoverIP)
meas
= r
useful
equals the sum of useful data rate r
meas
+ r
0
of the external transport stream. The data
useful
and the rate of null packets r0:
useful
3.2.3 Test signal settings
Access:
► Select "Input Signal > Test Signal".
The tab provides settings to configure the input test signal.
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Settings:
Test TS Packet.............................................................................................................. 17
PID Test Packet.............................................................................................................17
PID (Hex)...................................................................................................................... 17
Payload Test/Stuff......................................................................................................... 17
PRBS............................................................................................................................ 17
Test TS Packet
Specifies the structure of the test transport stream packet that is fed to the modulator.
"Head/184 Payload"
"Sync/187 Payload"
Remote command:
[:SOURce<hw>]:BB:DTMB:TSPacket on page 53
DTMB configuration and settings
Input signal settings
A sync byte (0x47) followed by three header bytes and 184 payload
bytes.
A sync byte (0x47) followed by 187 payload bytes.
PID Test Packet
If a header is present in the test packet ("Test TS Packet > Head/184 Payload"), you
can specify a fixed or variable packet identifier (PID).
"Null"
"Variable"
Remote command:
[:SOURce<hw>]:BB:DTMB:PIDTestpack on page 54
PID (Hex)
Sets the PID.
If "PID Test Packet > Null", "PID (Hex) = 1FFF" is fixed.
If "PID Test Packet > Variable", you can edit the value.
Remote command:
[:SOURce<hw>]:BB:DTMB:PID on page 54
Payload Test/Stuff.
Defines the payload area content of the TS packet.
You can select PRBS or exclusively data in hexadecimal format as payload.
For "Source > Test Signal", the packet is a test packet.
For "Stuffing > On", the packet is a null packet. Null packets are inserted into the external transport stream to adapt the stream data rate. See also "Measured Data Rate"
on page 16.
Remote command:
[:SOURce<hw>]:BB:DTMB:PAYLoad on page 53
The header of the test transport stream packets has a fixed setting of
null packet header 1FFF (hex).
Uses the header value defined with PID (Hex).
PRBS
Sets the length of the PRBS sequence.
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You can select a PRBS 15 or a PRBS 23 sequence as specified by ITU-T O.151.
Remote command:
[:SOURce<hw>]:BB:DTMB:PRBS[:SEQuence] on page 54
3.2.4 IP channel x settings
Access:
1. Select "Input Signal > General".
2. Select "Source > External"
3. Select "Input > IP"
4. Select "Input Signal > IP Channel x"
DTMB configuration and settings
Input signal settings
The tab provides settings to configure IP channel x.
You can configure settings for 4 IP channels x = 1 to 4 individually, see also "Input
Signal > General > IP TS Channel".
IP channel settings affect input IP data of the local IP data network. The settings are
independent from the used broadcast standard configuration.
Saving/recalling a certain IP channel or local IP data network configuration is not possible via the broadcast standard-specific functionality.
Use the global save/recall functionality instead, see section "Saving and Recalling
Instrument Settings" in the R&S SMCV100B user manual.
The table below shows the availability of the tab in the broadcast standard configuration.
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Table 3-1: IP channel configuration support in broadcast standards
See also:
●
●
Requirements
DTMB configuration and settings
Input signal settings
Baseband standard "IP Channel x" Baseband standard "IP Channel x"
"ATSC/ATSC-M/H" Yes "DVB-S" Yes
"ATSC 3.0" No "DVB-S2" Yes
"DTMB" Yes "DVB-C" Yes
"DVB-T" Yes "J.83/B" Yes
"DVB-T2" Yes "DRM" No
"ISDB-T" Yes "Audio AM" No
"T-DMB/DAB" Yes "Audio FM" No
Chapter 4.1.1, "How to apply an external IP input signal", on page 37
Chapter 3.5, "Local IP data network settings", on page 24
At your IP source, set the "transport stream packets per internet protocol packet" (TP
per IP) parameter as follows:
●
If TP packet length = 188 bytes: Set TP per IP to 7 or 6.
●
If TP packet length = 204/208 bytes: Set TP per IP to 6.
We recommend that you use a separate LAN infrastructure to stream the transport
streams via IP to the IP connector of the baseband board. Also, avoid TS packet losses during IP transmission.
Settings:
Input IP..........................................................................................................................19
Alias.............................................................................................................................. 19
Type.............................................................................................................................. 20
Multicast Address..........................................................................................................20
Port................................................................................................................................20
IGMPv3 Source Address...............................................................................................20
Ping Source Address.................................................................................................... 20
Ping Result....................................................................................................................20
Local IP Data Network.................................................................................................. 21
Input IP
Activates/deactivates the IP input.
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>[:STATe] on page 55
Alias
Sets a unique name for the IP connection.
The definition of a name is optional but facilitates identification in the measurement
views. The name input fits maximum 16 characters in ASCII format.
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Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:ALIas on page 56
Type
Sets the input signal type.
"Unicast"
"Multicast"
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:TYPE on page 56
Multicast Address
Editing requires "Type > Multicast".
Sets the destination IP address (IPv4) of the IP connection.
You can set addresses from "224.0.0.0" to "239.255.255.255".
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:MULticast:ADDRess on page 57
DTMB configuration and settings
Input signal settings
Analyzes all unicast IP packets that arrive at the specified "Port".
When an IP address is in the multicast address range, an attempt is
made to join a multicast group using IGMP.
Set "Multicast Address" and "Port".
Port
Sets the destination UDP port.
Due to UDP/RTP autosensing, we recommend that you set a port offset of at least 6
between neighboring IP TS channels.
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:PORT on page 56
IGMPv3 Source Address
Requires "Type > Multicast".
Sets the IGMPv3 source address.
If you need to filter the data sent to the multicast address, specify the source address.
A source address different from "0.0.0.0" accepts only data originating from the specified IP address.
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:IGMP[:SOURce]:ADDRess on page 57
Ping Source Address
Clicking "Ping Source Address" triggers pinging of the IGMPv3 source address.
If you set a different value from "IGMPv3 Source Address = 0.0.0.0" and click the button, the software checks if the address is reachable.
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:IGMP[:SOURce]:PING on page 57
Ping Result
Displays the result after pinging the source address.
If "Ping Result > Ping: Successful", the source address is available in the network.
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If "Ping Result > Ping: Transmit Failed. xxx", the source address is not available in the
network. "xxx" can be, e.g. "General Failure". Try another "IGMPv3 Source Address".
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:IGMP[:SOURce]:RESult? on page 57
Local IP Data Network
Accesses local IP data network settings, see Chapter 3.5, "Local IP data network set-
tings", on page 24.
3.3 Coding settings
Access:
► Select "Baseband > DTMB > Coding".
DTMB configuration and settings
Coding settings
The dialog provides settings to configure coding.
Settings:
Channel Bandwidth....................................................................................................... 21
Single Carrier Mode...................................................................................................... 22
Dual Pilot Tone.............................................................................................................. 22
Control Frames............................................................................................................. 22
Constellation................................................................................................................. 22
Code Rate..................................................................................................................... 22
Guard Interval............................................................................................................... 23
Guard Interval PN......................................................................................................... 23
Time Interleaver............................................................................................................ 23
Channel Bandwidth
Selects the channel bandwidth.
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Remote command:
[:SOURce<hw>]:BB:DTMB:CHANnel[:BANDwidth] on page 58
Single Carrier Mode
Enables/disables single carrier mode.
"On"
"Off"
Remote command:
[:SOURce<hw>]:BB:DTMB:SINGle on page 47
Dual Pilot Tone
Requires "Single Carrier Mode > On".
Enables/disables insertion of the dual pilot tone.
"On"
DTMB configuration and settings
Coding settings
Uses single carrier mode.
Uses COFDM as modulation scheme for multi-carrier mode.
Inserts 2 pilots at ±0.5 symbol rate.
"Off"
Remote command:
[:SOURce<hw>]:BB:DTMB:DUAL:PILot on page 47
Control Frames
Defines whether a control frame is added to each signal frame group or not.
"On"
"Off"
Remote command:
[:SOURce<hw>]:BB:DTMB:FRAMes on page 59
Constellation
Defines the constellation.
Remote command:
[:SOURce<hw>]:BB:DTMB:CONStel on page 58
No pilot insertion.
Adds a control frame to each signal frame group. Each control frame
consists of two 188 byte transport stream packets with PID 0x17
(PID = packet identification).
A control frame is distinguished from the rest of the signal frames as
follows:
●
Always QPSK modulated
●
Processed with a code rate of 4/9 in the channel coding
●
During a control frame, the byte interleaver is bridged
Adds no control frame to the signal frame group.
Code Rate
Sets the code rate.
"0.4"
"0.6"
"0.8"
Remote command:
[:SOURce<hw>]:BB:DTMB:RATE on page 59
Requires "Constellation > 4QAM/16QAM/64QAM".
Requires "Constellation > 4QAM/16QAM/64QAM".
Available for all constellations.
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R&S®SMCVB-K166
Guard Interval
Sets the guard interval length.
"420 Symbols"
"595 Symbols"
DTMB configuration and settings
Coding settings
420 symbols correspond to 1/9 of the total carrier count, that is 3780
carriers.
595 symbols correspond to 17/108 of the total carrier count.
"945 Symbols"
945 symbols correspond to 1/4 of the total carrier count.
Remote command:
[:SOURce<hw>]:BB:DTMB:GUARd on page 59
Guard Interval PN
Defines the initial condition of the PN sequences in the frame headers.
"Variable"
"Constant"
Uses the definition of the table in the standard.
Uses the initial condition of index 0 for all signal frames.
Remote command:
[:SOURce<hw>]:BB:DTMB:GIC on page 59
Time Interleaver
Defines the depth of the basic delay.
Time interleaving minimizes the negative influence of spurious noise on the transmission process and increases the robustness of the overall system. The signal delay is
implemented in the same way as with the byte interleaver using paths with increasing
delay depth.
Unlike the byte interleaver, the symbols are interleaved with the aid of a device (convolutional) with increasing delay depth. A byte interleaver operates at the transport
stream level.
The delay depth x
increases with the positions of the device by the following delay
delay
stages:
x
= B * (B − 1) * M
delay
Where:
●
B is the number of device positions, that is fixed to 52.
●
M is the depth of the basic delay in symbols. The signal delay increases with the
value of M.
"240/720 Symbols"
Basic delay of 240/720 symbols
"Off"
Disables/bridges the time interleaver.
Remote command:
[:SOURce<hw>]:BB:DTMB:TIME[:INTerleaver] on page 60
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R&S®SMCVB-K166
3.4 Special settings
Access:
► Select "Baseband > DTMB > Special".
Settings different from the broadcast standard can be useful for research and development. Applying these settings requires "Special Settings > On".
If you set a parameter different from the specification, the warning icon is displayed
to the left of the parameter.
DTMB configuration and settings
Local IP data network settings
The tab provides settings, that differ from the specification of the broadcast standard.
Settings:
Special Settings............................................................................................................ 24
SI Power Normalization.................................................................................................24
Special Settings
Enables/disables special settings.
The setting allows you to switch between standard-compliant and user-defined channel
coding.
Remote command:
[:SOURce<hw>]:BB:DTMB[:SPECial]:SETTings[:STATe] on page 61
SI Power Normalization
Enables or disables the system information (SI) power normalization.
Remote command:
[:SOURce<hw>]:BB:DTMB[:SPECial]:SIPNormal on page 61
3.5 Local IP data network settings
Access:
1. Select "Input Signal > General > Source > External".
2. Select "Input Signal > General > Input > IP"
24User Manual 1179.1041.02 ─ 04
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